Mechanism for grinding machines



June 10, 1952 F. B. HATEBU'Ry MECHANISM FOR GRINDING MACHINES l 2 SHEETS- SHEET 1 mvENToR Filed July- 21, 1947 n ATTORNEYS F. B. HATEBUR MECHANISM FOR GRINDING MACHINES June 10, 1952 2 SHEETS-SHEET 2 Filed July 21, 1947 Patented June 10,Y l1952 I UNIT-151DI fpzrliz;rrr

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Application 'July 21, 1947, Serial No. 762,349 In Swit'ei'land Junel 22,179.46 Y

4 -2 Claims. 1

This invention relates to the grindingv` of 'workpieces bounded by surfaces of revolution and .in particular to an auxiliary .mechanism for machines grinding the work-piece when located between a rota-ting diskanda suitable rectilinear support. Grinding-machines of. this kind may be termed the centreless type, as distinct from machines holding the work-piece rotatably between two spaced points 'of centrically aligned tools, termed the centre type.

The grinding of the surface of workpieces, bounded by surfacesof revolution, by machines of the centreless type often lacks precision because the work-piece is not rmly fixed in longitudinal direction, as provided for in the centre type machine.`

The present invention has as its main object to provide auxiliary mechanism for the centreless grinding-machine which enables it to additionally fix the work-piece between spaced points of such tools as employed with centre type machines, whereby the work-piece is rmly xed in longitudinal direction.

Another object of the present invention is to provide a method for removing and fixing the work-piece in a grinding-machine of the centreless type provided with auxiliary mechanism,

comprising the steps of raising the work-piece.

from its grinding position between the control disk and the rectilinear support and subsequently sliding the auxiliary mechanism with the work-piece laterally towards one side of the grinding-machine for manual removal and xing another work-piece by reversing the sequence of said steps.

A further object of the present invention is to provide said mechanism in such manner as to be capable of being actuated by motor power.

Other objects and advantages will be apparent from the following description when read in connection with the accompanying drawings, in which:

Figures 1 and 4 are cross-sections of a grinding-machine of the centreless type, provided with the new axuiliary mechanism according to my present invention, in working condition;

Figure 2 is a frontal elevational view showing the new auxiliary mechanism in working condition;

Figure 3 is a cross-section of a grinding-machine of the centreless type provided with the new auxiliary mechanism in the raised condition of the work-piece;

Figure 5 is a frontal elevational view, showing the new auxiliary mechanism displaced in axial 2 Y direction in relation 'to the control 'disk and :the rectilinear support.

Referring to the `drawing ubycharacters-v of re'ference,reference numeral` I- designates the base of the rectilinear support of the machine-tool, supporting alsothefnew auxiliary mechanism, 2 is the control disk,3 the-rectilinearA supportandl the grinding disk. The present inventiondoes not pertain Vto thefabove items, which vare commonly used in grinding-machines ofthe centreless type forwork-pieces boundedby surfaces of revolution.

Reference numeral 5 designates thepointslon the tool 8, which issupported in ,a `bore atl the end. ofthe arm 6. Screws 9 andfIIlserve hfor adjustments of 'the tools 8. The working-piece I isirmly fixed in longitudinal direction between the points 5.

The links II are keyed to the shaft I3 and are spaced to support the ends of shaft I2. On the shaft I2, contiguous with the links II, arms 6 are keyed. Either arm 6 and link I I on the ends of the shaft I2 are provided with lugs I9, having a pressure spring I8 attached in between, which urges the arm 6 to rotate with the shaft I2. The arms 6 and the links I I form thus knee joints, so as to raise the tool 8 and the work-piece I when moved by rotation of the shaft I3 in counterclockwise direction out of working position. The knee-j oint movement is limited by the abutments I6, I'I on the link 6 and the arm II respectively.

The shaft I3 is slidably and rotatably supported by the bearings I4, I5. The sliding movement of the shaft I3 is limited by the bearing I5 serving as a stop in regard to the hubs of the links II. The shaft I3 extends towards the left to co-operate with suitable actuating means (no-t shown). It is understood, that such actuating means may comprise either manual means or a motor, such as a hydraulic motor.

The work-piece 1 is inserted between the points 5 and firmly set fast by the tool 8. Screws 9 and I0 are provided for the fixing of the tool 8.

Functioning of the auxiliary mechanism is as follows:

For the positioning of the work-piece 1 into the machine-tool the struture formed by the parts B, II, I2 and I3 is positioned in relation to the control disk 2 and the rectilinear support 3 as shown in Figure 4. Thereby the holding means, i. e. the points '5 are raised in relation to the working position and laterally moved outside the working position, thereby positioned to readily mount the working-piece 'I, provided with centers 20, between the points 5. A rotating and tions for conditioning the Work-piece to the Working position.

It is claimed and desired to secure by Letter Patent: 1. A grinding-machine for Work-pieces bounded by surfaces of revolution, comprisingpointed A tools rmly iixed in longitudinal direction for holding the Work-piece therebetween, a rectilinear support supporting the Work-piece in vertical direction in working position,a rotatable control-disk, means for conditioning the Workpiece in grinding position and for removing the Work-piece after treatment by reversing the movements of said means for conditioning the Work-piece in the grinding position and actuating means for said last named means, said means for conditioning thework-piece comprising a slidable and rotatable shaft, links xed to said shaft, a second shaft pivotally mounted in said links, arms upon said second shaft and spring means cooperating Withsaid arms.

2. A grinding-machine for Work-pieces bounded by surfaces of revolution, comprising pointed tools firmly iixed in longitudinal direction for holding the Work-piece therebetween, a rectilinear support supporting the work-piece in vertical direction in Working position, a rotatable control-disk, means for conditioning the Workpiece in grinding position and for removing the Work-piece after treatment by reversing the movements of said means for conditioning the Work-piece in the grinding position and actuating means for said last named means, said means for conditioning the Work-piece comprising a first shaft, a second shaft, spaced links pivotally connecting said second shaft to said first shaft, arms mounted contiguous to said links, pressure springs cooperating with said arms and abutments upon l said arms and links, forming knee joints, the free ends of said arms centrically and adjustably supporting said-pointed tools, bearings supporting said iirst shaft, one of said bearings serving as a stop for the hubs of said links thereby limiting the extent of the sliding movement of said iirst shaft and said rst shaft being slidable and ro- Y tatable for moving the work-piece in and out of Working position.

FRITZ BERNHARD HATEBUR.

REFERENCES CITED The following'references are of record in the le of this patent:

UNITED STATESv PATENTS Germany Nov. 9, 1931 

